Dental impression-cup.



No. 720,105. PATENTED FEB. 10, 1903. G. A. BROUILLET. DENTAL IMPRESSIONCUP.

APPLICATION FILED MAY 31, 1902.

N0 MODEL.

UNITED STATES GEORGES A. BROUILLET, OF

PATENT @FFICE.

BOSTON, MASSACHUSETTS.

DENTAL IMPRESSION-CUP.

SPECIFICATION forming part of Letters Patent No. 720,105, dated February10, 1903. Application filed May 31, 1962. Serial No. 109,581- (Nomodel.)

To all whom it may concern.-

Be it known that LGEoReEs A. BROUILLET, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Dental'lmpression-Cups, of which the following is aspecification.

My present invention relates to improvements in impression-cups for theuse of dentists in taking impressions of the lower jaw.

The object of my invention is to make a simple adjustable cup, so that acertain class of jaws may be more correctly and easily taken, especiallyupon the inside, and that the plate made from such impression may beworn with much greater comfort. There are also other advantages whichwill be readily apparent to any one skilled in the art.

Hitherto these impression-cups have usually been made rigid from onepiece of metal and of the same general form, diiferent sizes being usedto correspond with the general size of the jaw. There has also been usedto a limited extent a cup arranged to be adjustable laterally in orderthat a less number of cups might be employed. In this case the walls ofthe cup are formed rigid, but may be moved as a whole out and in, sothat the cup may be made wider or narrower. In use the said cup isadjusted to the proper width required and then used the same as anordi-' nary cup. This simply lessens the number of sizes of cups neededto be kept on hand, but does not fit the jaw any better or differentlythan the usual style first named.

I am aware that cups with elastic rims or flanges have been employedtoprotect the gums, tongue, or other parts of the mouth from the plasterused in making the impressions or to aid the removal of small pieces-ofbroken plaster; but these do not appertain to the spirit of myinvention.

My present invention has special reference to a form and design of cupthat may be closely fitted to the jaw on the inside after being insertedin the month. In many cases the interior wall ofthe under jaw on eachside along the bottom near to and at the back recede, thereby forming acircular channel which renders it extremely difficult to obtain aperfect impression. In all such peculiar conformations by my presentinvention I am enabled to obtain an impression of the interior, back,andside walls most perfectly. This cannot now be accomplished by any otherimpression-cup known to me. From an impression thus made a moreperfectly fitting plate can be made, the said plate having the addedadvantage of locking under the jaw in such a manner that it is betterretained in its normal position in the mouth, and it is worn withincreased comfort. I

In the accompanying drawings, Figurel is a plan view of the body of myimproved cup. Fig. 2 is a front elevation of the same. Fig.

3 represents a part of the body as cut from Fig. 1 on line 3 3, theinner wall or lip of the cup showing. Fig. at is a modification of theform of the section shown by Fig. 3. Figs. 5 and 6 are sections on line5 5, Fig. 1.

In Fig. 1, A represents the body of the cup, the usual handle not beingshown. In Fig. 2, a represents the inner wall or lip, and b the outerWall of the cup. This form of cup is designed for use in takingimpressions of the under jaw. In manyinstances the under jaw upon theinner side s slants under, so that the form of cup hitherto used doesnot fit with any degree of exactness. I have therefore conceived theform of cup shown in the drawings and which is preferably cut out in thecenter inside, as shown in Fig. 2 at c. From the point 0 the inner wallor lip ct is preferably elongated and the metal is formed thin andpliable, thou'gh retaining sufficient stiffness to sustain the materialfrom which the impression is made. The outer walls and other parts ofthe cup may be of the usual thickness, if desired.

In operation the cup is placed over the jaw in the usual manner, andthen the inner walls or lips a a are pressed toward the jaw and thestiffness of the metal holds in place the material with which theimpression is being made. In Fig. 5 the position of the inner wall a isshown as ordinarily used, while the dotted line shows the wall or lip inits application to the special conformation of jaws hereinbeforedescribed. In Fig. 6 the reverse is shown, in which the lip a is shownas in use and the dotted line as when first inserted, the latterposition resembling the position of the inner wall of the ordinary cupsheretofore in use.

My cup may be made of the same thickness what I claim as new, and desireto secure by 30 of material throughout, provided the pliability andstillness of the inner lips are assured, or the walls may be of uneventhickness, as illustrated in the drawings.

In Fig. 4 I show a modification of the lip a, which may be used withthicker or stiffer material, and consists of the same form of lip, butprovided with the slits a a for the purpose of giving pliancy to thelower end of the lip a, thus enabling it to be readily turned under andclosely fitted against the lower inside of the jaw; but I prefer to formthe whole lip a, of thin, pliable, or yielding material of a thicknesswhich will give the necessary yielding and pliancy with the requisitestiffness.

The expense of making my new form will be little, if any, more than thatof the old styles of cups.

The cup is made, preferably, of one piece of metal, with a shortprojection back of the exterior center of the body to be used as aconvenient handle.

I do not show any form designed to be used in connection with the upperjaw, as the peculiarities mentioned are chiefly confined to the lowerjaw.

Having now fully described my invention,

Letters Patent of the United States, is-

1. The integral metal dental impressioncup herein described, consistingof exterior and interior walls; the interior walls being substantiallyremoved near the central portion and having the extremities of the innerwalls or lips elongated and made pliable or yielding in order to beclosely fitted to the inside bottom of the lower jaw, and of sufiicientstiffness to hold the material in place while theimpression is beingtaken, all substantially as and for the purposes set forth.

2. A metal impression-cup, having inner flexible walls, in combinationwith integral outer rigid walls, substantially as and for the purposesdescribed.

3. A metal dentalimpression-cup, provided with inner lips or wallshaving the slits a a to allow the material to be easily bent, incombination and integral with the rigid outer walls and body of said cupsubstantially as set forth.

In testimony whereof I have afiixed my signature in presence of twowitnesses.

GEORGES A. BROUILLET.

Witnesses:

BownolN S. PARKER, MARY E. HOLMES.

